site: add web app manifest + PWA icons (installable metadata)
Adds the manifest, icon set (192/512 + maskable, magnifier glyph on a dark
tile, generated by icons/render.py), and the <head> tags — manifest link,
theme-color, apple-touch-icon — across all seven pages. _headers serves the
manifest as application/manifest+json.
This is the installable-metadata half of PWA support. Offline/caching still
needs a service worker (deliberately not hand-rolled yet — researching the
right generated-SW approach for this no-build static site).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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